10 Best Transmission Additive For Hard Shifting of December 2025

• Repairs Scratches and Damaged Working Surfaces - Improves Operation Of Synchronizers
• Increases Gear Contact Efficiency - Resulting in Better Gear Shifting Accuracy
• Works with Manual & Direct shift, Robotized Gear Boxes, Transfer Cases & Differentials
• Reduces Noise And Vibrations. Stops Slipping and Hard Shifting
• If There Is a Heavy Transmission Fluid Leakage - Transmission Will Still Work Up To 600 Miles

XADO

• PROTECT YOUR VEHICLE: zMAX Transmission Formula is easy to use! Micro-lubrication soaks into metal surfaces improving lubrication to reduce gear wear and varnish buildup. Keeps seals supple, preventing leaks and improving shifting.
• TRANSMISSION EFFICIENCY: Improve performance by adding the formula to your transmission fluid to reduce slippage and rough shifting. Brings back smooth shifting gears resulting in an improved response. Add every time you change your transmission fluid.
• TRANSMISSION LUBRICANT: Cleans varnish for smoother shifting and lubricates bearings, gears, and the hydraulic system. Perfect for both automatic or manual transmissions. Not for use in CVT transmissions. Does not void manufacturer's warranties.
• ECONOMICAL PREVENTATIVE MAINTENANCE: Pour into transmission fluid to keep the gears lubricated and in top condition. The eco-friendly formula is industry tested, mechanic trusted and improves the performance and the driving experience.
• TRUSTED QUALITY AND PERFORMANCE: zMAX is proud to be the Official Micro-lubricant of Speedway Motorsports. Trusted for over 80 years, the USA made Transmission Formula saves money at the pump and extends the engine life of all your vehicles.

zMAX

• Improves shifting
• Extends fluid life
• AFFORDABLE SOLUTIONS
• Reduces noise and shudder

Lucas Oil

• BG ATC Plus enhances properties of both new and used automatic transmission fluid.
• It improves fluid oxidation stability, thereby prolonging fluid life and the life of the transmission.
• It prevents leaks by conditioning hardened seals-keeping them soft and pliable.
• BG ATC Plus helps control transmission shudder' retards formation of sludge and varnish deposits and prevents foaming.

BG

• Reduces operating temperatures
• Eliminates station from all automatic & CVT transmissions
• Reduces coefficient of friction
• Transmission station eliminator minimizes metal to metal contact
• Eliminates rust & corrosion

Hot Shot's Secret

• Prevents overheating, reducing elevated operating temperatures up to 40 degrees Farenheit - Optimizes total transmission performance
• Eliminates transmission fluid foaming and oxidation and reduces wear throughout the transmission
• Eliminates clutch chatter and torque converter shudder; Softens and modifies harsh shifts making them quicker in duration
• Extends fluid life / Raises the thermal and oxidative stability of the fluid
• Only protectant that increases the fluid’s ability to transfer heat / Protects new seals and permanently restores older seals to a like-new condition, without adverse side effects

Lubegard

• The original transmission shudder fix
• A concentrated friction modifier formulated specifically for instantly eliminating torque converter lock-up shudder
• Provides four times less wear than regular ATF
• For use in any automatic transmission fluid (not for use in Ford Type F or CVT applications)
• Voted top product by transmission professionals

Lubegard

• Lucas Transmission Fix Stops Slip, Hesitation, Rough Shifting In Worn Transmissions And Completely Eliminates Most Seal Leaks
• Fit Type: Universal
• Can be added to existing fluid without draining any out
• Improves shifting

LUCAS

• Restores performance and fixes many transmission issues
• Stops slippage, hesitation and rough shifting in worn transmissions
• Eliminates most seal leaks and lowers operating temperatures in hard-working units
• Ideal for all uses including auto, diesel truck, motor homes and commercial vehicles
• Excellent for preventative maintenance and extends fluid life by up to four times

Cerma

• LONGER SYNCHRO LIFE - High-performance gear protection, satisfies the gear oil viscosity requirements of 75W, 80W and motor oil viscosities of SAE 30, 10W30, 5W30
• OFFERS QUICKER SHIFTS - MLT Gear Oil with balanced friction control for most manual transmission synchronizers. Other synthetic gear oils are often too slippery
• SAFE FOR BRASS SYNCHROS - As it lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications
• POPULAR MOTOR OIL FOR - BMW, Honda/Acura, Ford Focus, late-model Mini Cooper, Land Rover/Range Rover LT77S, Mitsubishi, Dodge & Jeep NV1500, NV3500, NV3550 & NV5600 truck transmissions
• WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises

Red Line